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frodo -
don't worry about pressure unless you have an actual means of pressurizing your system. the pressure in your engine can't get above the water pressure from your hose, which is not very high.
you asked what COULD happen if the pressure got too high. the answer is that you would pop a freeze plug out of the water jacket. these are pressure relief plugs designed to pop out if the coolant/water freezes & starts to expand.
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